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Reconnaissance of the uncharted low energy vibrational motions of acenaphthene
Journal of Molecular Spectroscopy ( IF 1.4 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.jms.2020.111296 Sébastien Gruet , Amanda L. Steber , Melanie Schnell
Journal of Molecular Spectroscopy ( IF 1.4 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.jms.2020.111296 Sébastien Gruet , Amanda L. Steber , Melanie Schnell
Abstract The room-temperature, millimeter-wave rotational spectrum of the small polycyclic aromatic hydrocarbon acenaphthene has been measured between 75 and 110 GHz. Accurate rotational and distortion parameters are presented due to the over 1400 transitions that have been included into a global fit. Besides observing transitions of the ground vibrational state, six vibrationally excited states have been identified: four fundamental modes ( ν 30 , ν 41 , ν 40 , ν 29 ), one overtone (2 ν 30 ), and one combination band ( ν 41 + ν 30 ). This is the first report of four of these excited states observed in the gas phase as two of the fundamental modes are IR inactive and the intensities of the overtone and combination bands are often too weak to be observed. These excited states reside less than 300 cm−1 above the ground state, and an experimental approximation of their band centers is presented. The rotational constants and line lists can be used to facilitate the search for this polycyclic aromatic hydrocarbon in the interstellar medium.
中文翻译:
苊的未知低能振动运动的侦察
摘要 在 75 和 110 GHz 之间测量了小多环芳烃苊的室温毫米波旋转光谱。由于全局拟合中包含 1400 多个转换,因此可以呈现准确的旋转和失真参数。除了观察地面振动态的转变之外,还确定了六种振动激发态:四种基本模式( ν 30 、 ν 41 、 ν 40 、 ν 29 )、一种泛音(2 ν 30 )和一种组合带( ν 41 + ν 30 )。这是在气相中观察到的四种激发态的首次报告,因为其中两种基本模式是 IR 非活性的,泛音和组合带的强度通常太弱而无法观察到。这些激发态位于基态上方不到 300 cm-1 处,并给出了它们频带中心的实验近似值。旋转常数和线表可用于促进在星际介质中寻找这种多环芳烃。
更新日期:2020-05-01
中文翻译:
苊的未知低能振动运动的侦察
摘要 在 75 和 110 GHz 之间测量了小多环芳烃苊的室温毫米波旋转光谱。由于全局拟合中包含 1400 多个转换,因此可以呈现准确的旋转和失真参数。除了观察地面振动态的转变之外,还确定了六种振动激发态:四种基本模式( ν 30 、 ν 41 、 ν 40 、 ν 29 )、一种泛音(2 ν 30 )和一种组合带( ν 41 + ν 30 )。这是在气相中观察到的四种激发态的首次报告,因为其中两种基本模式是 IR 非活性的,泛音和组合带的强度通常太弱而无法观察到。这些激发态位于基态上方不到 300 cm-1 处,并给出了它们频带中心的实验近似值。旋转常数和线表可用于促进在星际介质中寻找这种多环芳烃。